Pressure gauge



N V. 9, 1926. I awn E; A. SUTHERLAND PRES SURE GAUGE Filed Feb. 4, 1926' Attofney 15 which is-simple in construction, inexpensive,

- Patented p Nov 9,

nLfJnn A. SUTHERLAHD, or cannon, am e.

ranssu tn Given.

The present invention relates to improve ments in pressure gaugesfor use 111 ennection with the inflating valve of an .1nner tube, which is associated with a pneumatic "'5" tire. -ie J One ofthe important objects ofthe present invention sto provide a auge which is] of; such construction asto enab e the air pres [sure within the inner tube to be readily and easily as'cert'ainedwithout necessitating the removal of. the cap from the valve stem, such as must now be done where an independent pressure gauge is used.

til

v A further object is to provide a pressure gauge of the above mentioned character strong and durable, and further well adapted to the purpose for which it'ls designed.

'Ot-h'en objects and advantages course of the following description taken 'in connection withfthe accompanying drawing.

In the accompanying drawing form ng a part of this application, and in which like numerals deshgnate" like "parts throughout the same: 1 Y a Figure 1 is a centrallongitudinal sectional view through the pressure gauge embodying my inventio'n'showing'the same attached to the ordinary valve stem, and a f p Eigure Qis a side elevation of the cap or casing. i

In the drawing, wherein for the purposev of illustration is shown the preferred embodiment of my invention; the numeral 1 designates the substantially cylindrical casing or cap,the upper end'of which is closed, the lower. portion of the cap or casing 1 is enlarged as indicated at 2 whereby a shoulder 3 is formed-at the junctureof .the enlarged portion Q-audthe adjacent portion of the cap or casing. The purpose of the shoulder will be hereinafter more fully described.

I The lower portion'of the enlarged portion 2 is' internally threaded so that the cap or casing may be threaded on the valve stemf which is of the; usual lconstruction and is associated with'theinner tube in the usual manner. The valve which is mounted in the valve stem 4 is also of the'usual construc- I tion; and is indicated-at 5;

-The' cap or casing 1 1s providedat spaced intervals with the longitudinally extending n slots or sight openingsfi and \placedon the outer .face of tlie casing directly adjacent of this in-' vention" will become apparent during "the line 11 extending ciroumferentially therearound so that the same may be readily and ll'pplicationl filed February'4, 1926. Serial m; 5,973.

the lsideedgesof'the respective'slots are the graduations OIfSCa'lG marks indicated at 7-.

s Arranged within the lower-portion of'the cap. or casing 1-is the expansible air pocket 8 which is formed preferably of rubber; the

open lower end of said air pocket extends downwardly into the enlarged portion2 of the cap or caslng 1 and is vulcanized-to the inner'peripheral face of the metallic ring 9,

the'latter being adapted to fit snugly within the enlarged portion 2 and. being further adapted to abut the shoulder 3 in themanner as clearly shown in Figure 1 so'that the expansible air pocket will be maintained inproper position within-the cap or. casing. This'expansible air pocket is preferably arranged in such a manner as to extend di-' rectly over the v upwardly projecting por tion of thevalve 5 so that when the valve 5 7 is moved downwardly in the manner herei'nafter to be more, fully describe-d, the air .1

which escapes from the inner tube through the valve will enter the pocket 8 and cause the same to expand.

' Adapted forslidable movement withinthe cylindrical casing or cap 1 is the indicator member 10,' the same being in the fo'rm of a disc and having a preferably red colored easily visible through the-sight opening or slot 6. i

A1i expansible coil spring 12' arranged within the casmgor cap 1 and is disposed tends upwardly into the air pocket 8 and is 100 then disposed laterally and thence downwardly and carries on the free endthereof the. valve engaging head-14.

Whenthe cap is threaded downwardly.

on "the valve stem .a sufficient distance in 105 o'rder, to vpermit the-head 14:, to engage the valve-5 and move the same downwardly, :a- Y

certain amountof the air in theinner tube I willes'cape out through the valve stem and will enter the pocket- 8, and will cause the no son] its lower end latter to expand and simultaneous with the each of the tires.

l Vhenever it is necessary to inflate the pneumatic tire, the cap may be easily removed, and the. inner tube inflated in the usual manner. v

lhe provision of a pressure gauge of the above mentioned character Wlll save considerable time and labor in ascertaining the.

amount of air contained within a pneumatic tire and furthermore the use of a separate or independent pressure gauge will be eliminated' While I have shown the preferred 'embodi} mentof my invention it is to'beunderstood that-minor changes in-the size, shape, and arrangement of parts may be resorted to without departing from the spirit of the in-v vention and the scope of the appended claims.

l by Letters Iatent is 2-- Having thusdescribed the invention, what I claim as new and desire to secure 13A pressure gauge comprising a cylindrical casing closed at its upper end, the

lowerend of the casing being enlarged, said enlarged end adaptedto'be threaded on the pneumatic tire valve stem and normally spaced from the base thereof, an e'xpansible air pocket arranged within the casing directlyover the valve. in the upper end of the valve stem, a retaining ring secured to the lower open end of the air receiving pocket, said ring. being fitted in the enlarged portion of the casing, an indicator member operable within the upper portion of the between the closed upper'en of the casing and the upper face of the indicator member casing, an expansible coil s ring disposed for normally holding the latter in engage-' I ment with the upper closed end of the air pocket, a bracket secured --'on the inner side of the enlarged portion of the casing and extending upwardly into the air receiving pocket, ahead formed on the free-end of the bracket and disposed directly above the valve stem and normally in engagement with the valve to permit the escape of the air frdmthe pneumatic t-ire into the expansible air pocket whereby the indicator memher is actuated when the casing ismoved downwardly on the'valve stem.

2. A pressure gauge comprisinga cap closed at its upper end, the open lower end thereof being adapted to be threaded on the usual pneumatic tire valve stem and being enlarged,'the lower end ofithe cap being normally spaced from the base of the valve stem, said cap being provided with a series of longitudinally extending annular spaced sight openings, an expansible air pocket arranged within the cap directly over the valve in the valve stem, a retaining ring secured to the lower open end of the air rece ving pocket, said ring being fitted in the enlarged portion of the cap, an indicatormemher operable Within the upper portion of the cap, an expansible coil spring disposed between the closed upper end of the cap and the up er face of the indicator member for normal y holding the latter in engagement with the'upper closed end of'the air receiving pocket, and means carried by the cap for actuating the valve in the valve stern to permit the air to escape from the pneumatic tire through the valve into the airreceiving pocket whereby said indicator member may be actuated when the cap is threaded 'downwardly on the valve stem.

ture.

In testimony whereof I aflix my signa- 

